from ultralytics import YOLO yaml_file_path = '/path/to/yaml/file/data.yaml' model_path = '/path/to/model/file/yolov8n.pt' Set pre-trained model weights: model = YOLO(model_path) # Training: model.train(data=yaml_file_path, epochs=100, imgsz=640, workers=2) # Validating: best_model_path = 'path/to/best/model/file/weights/best.pt' model = YOLO(best_model_path) metrics = model.val(data = yaml_file_path)